Master Biology with Fun Quizzes & Brain Teasers!

What is density of a liquid with mass of 17.4 and a volume of 20 mL ? Would this liquid float or sink at room temperature based on its density and the known density of water?
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Write a paragraph in the space below, explaining in your own words how electromagnetic radiation is created by the Sun. Describe the difference between the different forms of electromagnetic radiation and how scientists classify the types of electromagnetic radiation.
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what is crop fallowing?Please reply fast I need to do my biology assignment !!!
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How do i know if its entering or leaving or neither just by the precentage?
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Describe the difference between the different forms of electromagneticradiation and how scientists classify the types of electromagnetic radiation.
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Activity A (continued from previous page) 4. Observe: Wait until the numbers are not changing very much. What do you notice about the solute concentrations inside and outside of the cell? This situation is called dynamic equilibrium
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Tropical rain forests tend to have soils that are nutrient poor, and most of the nutrients are found in the top few inches of the soil.Which adaptation is most likely found in tropical trees?A. deep root systemsB. shallow root systemsC. needlesD. pine cones
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A ________________________________ describes a pattern observed in nature.
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Cells reproduce by splitting in half, a process called cell division. What do cells need to do between divisions to make sure that they dont just get smaller and smaller?
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What happened to the greenish warbler birds as they migrated from the southern portion of their range up around the Tibetan Plateau? a. They evolved separately as they moved north and became two separate species. b. The original species died off, but the ones that were able to adapt to a northern climate evolved into a new species. c. As a whole the species was able to adapt to a colder climate, but no significant changes occurred. d. They were unable to adapt and evolve to ensure their survival and became extinct. Please select the best answer from the choices provided A B C D
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I. Plant cells are formed from fertile soil. II. Animal cells must function properly for an organism to be healthy. III.Cells make up the petals, stem, and leaves of a lily plant. IV. Bacteria are produced from other living bacteria. Which describes the statements that Schwann and Schleiden would make? Schwann would make Statement I and Schleiden would make Statement IV. Schwann would make Statement II and Schleiden would make Statement III. Schwann would make Statement III and Schleiden would make Statement II. Schwann would make Statement IV and Schleiden would make Statement I.
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An element is made up of how many types of atoms? Question 1 options: An element is made up of three types of atom. An element is not made up of atoms. An element is made up of only two types of atoms. An element is made up of only one type of atom.An element is made up of how many types of atoms? Question 1 options: An element is made up of three types of atom. An element is not made up of atoms. An element is made up of only two types of atoms. An element is made up of only one type of atom.
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A cross was made between two strains of plants that are agriculturally important. One strain was disease-resistant but herbicide-sensitive; the other strain was disease-sensitive but herbicide- resistant. A plant breeder crossed the two plants and then allowed the F1 generation to self- fertilize. The following data were obtained: F1 generation: All offspring are disease-sensitive and herbicide-resistant F2 generation: 157 disease-sensitive, herbicide-resistant 57 disease-sensitive, herbicide-sensitive 54 disease-resistant, herbicide-resistant 20 disease-resistant, herbicide-sensitive Total: 288 Formulate a hypothesis that you think is consistent with the observed data. Test the goodness of fit between the data and your hypothesis using a chi square test. Explain what the chi square results mean.
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You are asked to study a new inhibitor of oxidative phosphorylation. When it is added to a suspension of mitochondria carrying out this process, both ATP synthesis and oxygen consumption are inhibited. You suspect that the inhibitor blocks either the F-type ATPase or the electron transport chain. You can perform an experiment that measures the consumption of oxygen and the synthesis of ATP by isolated mitochondria. In one paragraph (6 sentences maximum), explain how the uncoupler, dinitrophenol, can be used to determine whether the inhibitor blocks the ATPase or the electron transport chain.This was all the information that was given.
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Choose the letter that indicates the organelle that contains most of a cell's DNA. An animal cell with definite structures labeled from A to E. The vesicles with solid particles inside are labeled A. The vesicles with no solid matter inside are labeled B. The large membrane-bound organelle is labeled C. It is located in the center of the cell and contains a mass of densely stained granules and fibers. The structure labeled D consists of flattened membranous-like stacks. The tiny dots labeled E are located everywhere in the cell and do not have any membrane.
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You are studying three populations of an endangered species of toad that used to be common in the California central valley. Global warming has caused this species to retreat to higher elevations in recent decades where it stays cooler; the toad used to be found throughout the valley, but is now restricted to the tops of three mountains. Historical records indicate that there used to be hundreds of thousands of toads in the central valley, but sampling the mountaintops reveals that the toad population on each is now limited to a few hundred individuals. You survey allozyme diversity at one locus on each of the three mountaintops and find that each population is fixed for a different allele of the ribbit gene: mountain #1 is fixed for the A1 allele, mountain #2 for the A2 allele, and mountain #3 for the A3 allele. The average number of baby toads born in each population is the same, and the environment on each mountaintop is very similar, as far as your data show.Explain why each population is fixed for a different allele.Sentence 1: Describe the variability that was initially present in each of the populations.Sentence 2: State which individuals had the highest fitness in a given population, or why fitness is not an issue if that is your conclusion.Sentence 3: Explain what evolutionary force acted on the population(s), and why and how it acted.Sentence 4: Describe how the populations evolved in response to their changing environment. Be as specific as you can (e.g., say "increased" or "decreased", rather than just "changed".)
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A series of two-point crosses, involving 7 genes (a-g), were carried out, and the following recombination frequencies were obtained. Place the seven genes into linkage groups (where a linkage group is any group of genes that are genetically linked to each other). Within each linkage group, determine the order of genes and the distances between them. Genes % recombination Genes % recombination a-b 50 c-d 50 a-c 50 c-e 26 a-d 12 c-f 50 a-e 50 c-g 50 a-f 50 d-e 50 a-g 4 d-f 50 b-c 10 d-g 8 b-d 50 e-f 50 b-e 18 e-g 50 b-f 50 f-g 50 b-g 50
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Pilar just won a coveted award at work, even though many of her colleagues told her she didn't have a chance of getting it. While standing on the stage at the company's banquet dinner, she wanted to gloat and call out the people who didn't support her, but she knew this would not be appropriate. Instead, she stayed positive and smiled, thanked all of her colleagues, and graciously accepted the award. Pilar ended up conforming to this particular social setting's _____.
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The endosymbiotic theory provides compelling evidence that mitochondria and chloroplasts were once primitive bacterial cells. How are chloroplasts and mitochondria similar to prokaryotes? All but ONE apply. A) Chloroplasts and mitochondria contain DNA. B) Chloroplasts and mitochondria have a nucleus. C) Chloroplasts and mitochondria contain ribosomes. D) Chloroplasts and mitochondria have a double membrane.
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Identify the type of change illustrated.Propaganda Originally, propaganda meant a system for propagating (spreading) religious doctrines, then any kind ofideas. As used today, it generally means the dissemination of political opinions for the purpose of biasing judgment(brainwashing)
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In soreflies (a hypothetical insect), the dominant allele, L, is responsible for resistance to a common insecticide called Loritol. Another dominant allele, M, is responsible for the ability of soreflies to sing like birds. A true-breeding mute, Loritol-resistant sorefly was mated to a true-breeding singing, Loritolsensitive sorefly, and the singing, Loritol-resistant female progeny were testcrossed with true-breeding wild-type (i.e., mute, Loritol-sensitive) males. Of the 400 total progeny produced, 119 were mute and Loritol-resistant, 114 could sing and were Loritol-sensitive, 81 could sing and were Loritol-resistant, and 86 were mute and Loritol-sensitive. Do you think the (L) and (M) gene loci are linked or unlinked? Justify your answer
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PLEASE HELP ME I REALLY NEED THE ANSWER Which is the correct order of the Taxonomic Groups from broadest to more specific?a). Domain, Kingdom, Phylum, Class, Order, Family, Species, Genusb). Domain, Kingdom, Phylum, Class, Order, Family Genus, Speciesc). Kingdom, Domain, Class, Phylum, Family, Order, Genus, Speciesd). Domain, Phylum, kingdom, Class, Family, Order, Genus, Speciese. None of the above
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How do polar bear adapt to its environment?
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Joel claims that Bright White Toothpaste removes tooth enamel stains better than all other brands. Which of the following should be documented as evidence to support his claim?1. The amount of toothpaste used2. The shade of teeth before and after brushing3. The type of toothbrush used to brush teeth4. The size of tooth
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